The following statement is correct () A. The absolute value of a rational number must be positive B. if the absolute values of two numbers are equal, then the two numbers are equal C. If a number is positive, then the absolute value of the number is itself D. if the absolute value of a number is itself, then the number is positive

According to the nature of absolute value, we can know that: in a, when the rational number is 0, it is wrong; in B, the absolute values of two opposite numbers are always equal, which is wrong; in C, the absolute value of positive number is itself, which is correct; in D, the absolute value of 0 is also itself, which is wrong. So we choose C

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